Piston.



G. FRANK.

- PISTON.

APPLICATION FILED AUG.11, 1911.

1,054,345. 1 Patented Feb. 25, 1913..

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1,054,345. Patented Feb. 25, 1913.

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UNITED STATES PATENT OFFICE.

GUSTAV FRANK, 0F JEFFERSON. TEXAS. ASSIGNOR OF ONE-HALF TO MARTIN J. WHELAN. OF JEFFERSON. TEXAS.

To o/l whom. it may concern.

lle it known that l. (ics'riv FRANK, a citizen of the l nited States. and a resident of (ltdl'crson. in the county of Marion and State of Texas, have invented certain new and useful lniprovenicnts in listons, ol which the following is a specification, reference bring had to the :u-conumnying drawings.

This invention has relation to an improved expanding piston employed in connection with pumps; and the object of my invention is to provide a device of this general character. ot a simple and inexpensive nature and ot a compact and durable construction. which shall be capable of convenient and accurate adjustment in position upon a piston rod to adjustably receive the packing rings in a manner permitting the active rings being expanded, to take up and com pensatc the wearing away of the parts.

\Vith thes and other objects in view the present invention consists in the combination and arrangement of parts as will be hereinafter more fully described and tinallv pointed out in the appended claims, it beingfurther understood that changes in the specific structure shown and described may be made within the scope of the claims, without departing from the spirit of the invention.

In the accompanying drawings forn'iing a part of this specification. and in which like numerals of reference indicate similar parts in the several views: Figure 1, shows an elevational view with parts in section of a pump piston embodying my invention, the packing rings being eliminated and showing the spring snap ring in position. Fig. 2, shows a lengthwise sectional view through Fig. 1. Fig. 3, shows an end view. Fig. 41:, is a section on line 4, 4, of Fig. 1. Fig. 5, shows a perspective view of the truncated cone. Fig. (3. is a. perspective View of one of the segmental core members, of which is a section on line 7, 7, of Fig. 1.

In my present invention I aim to provide a piston especially adapted to be used in connection with pumps, of few parts. and constructed so that the packing rings can at all times be quickly and synchronously expanded to insure a water tight union between the piston and the cylinder.

In the accompanying drawings, the nu- PISTON.

Patented Feb. 25, 1913.

Serial No. 643,612.

mcral ,l. designates a piston rod which has one end 3, reduced to provide the stop shoul- (ler 1, shown in Fig. '2, this reduced end being threaded. l'ioosely held upon this threaded stem 2"), and stopped against the shoulder l, is the stop plate 2, of a diameter slightly less than the diameter of the cylinder in connection with which the piston is used. l.hreading upon the stem 3. is the truncated cone (3. shown in detail in Fig. 5, having a middle lengthwise running threaded bore 8. and at its largest end being provided with the square or angular boss 7. This cone (5. threads upon the reduced end of the piston rod, with its smallest end proximal to the disk 2, as shown in Fig. 2.

Adjustabl v and slidably held upon the cone (3, is a quadrigeminal segmental core comin'ising four similar members 5. the coinhined members when placed upon the cone (3, presenting an outer cylindrical surface. Each core member is provided with an inner concave bearing surface 6', shown in Fig. (i, and a cylindrical surface 5. These tour etpiiformed core members give support to the packing rings 12, shown in dotted lines in Figs. 1 and 2, these rings being of a suitable width. As shown in Fig. 1, the core members 5, are of a length less than the combined thickness of the packing rings 1"), while the cone (5, in turn is of a length less than the cores.

Held upon the square boss 7, is the follow plate 4, of a diameter less than the inner diameter of the cylinder in connection with which this piston is used. This follow plate is slidably held upon the boss 7, and is employed to clasp the packing rings 12. against the stop plate 2. This t'ollow plate 4, is provided with the spaced outstanding flanges 2, serving a specific purpose, in that a spanner wrench may be placed between the spaced flanges. in actuating the cores. lleld upon the stem 3. and against the follow plate %l-. is the washer 8. and working upon this washer 8, is the set nut 9, which is held in place by means of the lock not 9. as clearly shown in Figs. 1 and lln the operation of the piston. when the packing rings 12, wear away. owing to the grit and other impurities within the water. and become locsc within the cylinder, they can be expanded. in simply loosening the nuts 9 and 9. and adjusting a spanner wrench between the spaced flanges 2'. in rotating the follow plate a the cone ti, is rotated, resulting in the cone being advanced. As the cone advances, it spreads the core members which in turn synchronously expand the packing rings to bring their outer surfaces into water tight contact with the cylinder surface. been properly expanded, they are again clamped between the two plates 2 and 4:, by means of the nut 9.

From the foregoing it will be noticed that the cone 6, is employed to expand the rings, being rotated through the intermedium of the follower 4t, and that the follow plate 4, in connection with the nut 9, is employed to clamp the packing rings against the memher 2. The boss 7, should be shorter than the thickness of the follower 4, but a little longer than the possible incursion of said cone, that is the full distance the cone 6, is to travel, so that the boss willhever become detached from the actuating follower 4.

'I1i ;order to hold the segmental cones in position while the packing is removed, I employ a flat spring snap ring 15, shown in Fig. 1, which can be easily removed or placed in position. \Vhile I have shown and descrlbed four core sections, it should be understood that a greater or less number may be employed.

I rings between the plates, can be accomplished with ease, accuracy and despatch.

.Anincident of convenience to this arrangement of expanding the rings, is that no parts of the mechanism need be removed, it simply being necessary to loosen a nut, in order to advance the cone. i

Having thusdcscribed my said invention, what I claim as new and desire to secure by United States Letters Patent is:

1. A pump piston having in combination, a threaded rod, a stop plate upon said rod, a cone threading upon said rod and toward After the rings12, havesaid plate having an extending angular he, a plurality of core members held to said cone, said cone being of a length less than. said cores, a snap ring holding said cores to said cone; a packing ring upon said cores and snap ring, a follow plate upon said boss, and working against said packing rings said boss of a length greater than the possi ble incursion of said Come but of a length less than the thickness of said follow plate, and a nutupon said rod to hold said follow plate to said packing rings.

2. A pump piston having in combination, a threaded rod, a stop plate upon said rod, a cone threading upon said rod and toward said plate having an extending angular boss, a plurality of core members held to said cone said cone being of a length less than said cores, a packing ring upon said cores, a follow plate upon said bossand working against said packing rings said boss being of a. length greater than the possible incursion of said cone but of a length less than the thickness of said follow plate, said follow plate having spaced spanner receiving flanges, and a nut upon said rod to hold said follow plate to said packing ring.

3. A pump piston having in combination a threaded rod, a stop plate upon said rod, a cone "threading upon said rod and toward said plate having an extending angular boss, a plurality of core members held to said. cone said cone being of a length less than said cores, means to hold said cores to said cone, a packing ring upon said cores, a'follow plate upon said boss and working against said packing rings said boss being In testimony whereof'I affix my signature,-

in presence of two witnesses.

GUSTAV FRANK. Witnesses L. E. PURssELL,

J. C. KIs'rENMAonnR. 

